运行出现以下报错：
Couldn‘t connect to host, port: smtp.163.com, 25; timeout -1;
也要设置端口
spring.mail.port=25
Couldn't connect to host, port: smtp.163.com, 25; timeout -1;
文章来自：https://www.cnblogs.com/QW-lzm/p/8587494.html
运行出现以下报错：
Couldn‘t connect to host, port: smtp.163.com, 25; timeout -1;
也要设置端口
spring.mail.port=25